Drill.



M. W. SHERWOOD.

DRILL.

APPLIUATION FILED 8121230.71913.

Patented June 2, 1914.,

AMJQMM d,... .Vf/2% ...55.22.13 ...ivf-iev n In titl TE STATES PATENT OFFICE.

MATHER W. lHERWB, F FRANKLIN, PENNSYLVANIA, ASSIGNOR T CHICAGO PNEUMTI TlL GMPAN'Y, 0h" CHCAGO, ILLINOIS, A CORPORATION 0F NEW' lltllLL.

reactie.

`Speciliceftttm ot' Letters Patent.

application filed September 30, 1913.

Patented J une 2 1914.

Serial No. 7952,55?.

Toall Iwhom it may concern lie it known that l, Martien lW. Sinn:- woon, a citizen of the Unitedtitatea' residing" at. Franklin, Venango county, lPennsylvania, have invented certain new and usei'ul improvements in Drills., ot which the following is a specification.

lli/ly invention relates in general to drlling machines such asrock drills and incre particularly but not necessarily of that type commonly hnown as a stoper and the object thereot is to provide a simple, ecient and reliable machine of this character.

tion hereinafter given.

ln the drawing' Figure 1 is a central longitudinal sectional elevation or a drill enibodying rny invention; Fig. 2n sectional elevation on the line 2 2 oit Fig. l; Fig. 3 an elevation looking in the direction of the arrows .fl-3; Fig. d a similar view but looking in the opposite direction, that is in the direction of the arrows t-d ot Fig. 1.

Referring to the present embodiment ot iny y invention as herein shown, the same comprises three main parte, to wit the engine of the drill, the feed device thereof arranged in arial valinement with the engine,

and a head block connecting the engine and feed device and by preference orniingV a part ol the teed device.

My present invention concerns more particularly the feed device and the valve mechanisrn intermediate thesame and the engine. 'llhe latter, as to its details, forms no part et my present invention and hence the same will he described only in a general Way.

The engine part of the machine consists et afcylinder 1, piston 2, impact piece 3, drill socket d and distributing valve mechanism. The cylinder is provided with two similar inlet `passages 5 communicating with the source oi motive duid indirectly through the feed device in a manner hereinafter explained. Between these inlet passages is formed the distributing valve chamber coinlnunicating therewith by ports l and with the rear end of the piston chamber by port 8. rlhevalve 9 operates in a valve cage comprising two valve seats 10 and 11 and sleeve 12 which has inlet ports 13 communicating; with port 7. llhe two seats have ports la and 15 controlled by the valve, port 14 communicating with passage 16 leading to the front end of the piston chamber through port 17. A coiled spring 18 is interposed between the seat il and a plug 19 extending into the valve chamber and held in place hy the head block 20. ln ad dition to the ports mentioned thecylinder l has exhaust ports i7 and ,groove L18.

Referring next to the head block and subn sequently to the feed device, this block is adapted to torni the head of the cylinder and also to hold the plug` 19 in place, particularly when the latter is not screw threaded. lo this end this block is provided With a cylindrical boss 20a litting into the piston chamber and consequently interlocking with the cylinder. it is also pro vided with a series of ports 21 communi-Y cating' with cylinder exhaust ports herein after described. The block is also provided with a central bore or chamber 2Q for the passage oi inotive fluid tothe engine through a wide port communicating with the ports 5. This port 23 also receives at its central portion the diainetrical rib 19* of the plug thereby holding such plug in posi tion and serving as means for interlocking the block with this portion of the engine structure. Within the bore of the block is arranged a loaded valve comprising a pie ton 2d movable therein and held to upper position when viewed as in llig. l by means of the coiled spring 25 which loads the valve with from 20 to 25 pound pressure which is the desirableV one in practice. This coiled spring bears at its lower end against an adjustable nut or plug 2G screwing into the lower end of the block and after passing through the hollow piston it hears against the bottom of the socket formed by the hollow piston stem. At its upper end this stein carries a head 27 having ports or openings therethrough and constituting a valve gov erning the passage of the motive Huid to the valve chamber through the port 23, this head being movable to open and close said port. The motive fluid is supplied through the feed device and the same enters the chamber 22 through the port 28.

The feed device ma be described in general as consisting o with the result that 'the air admitted to them extends them and causes a feeding of the drill as the drilling operation proceeds. As herein shown the head block itself constitutes one of the main parts of these telescoping cylinders and in fact constitutes the mova le one or rather thevpiston portion of such feed device. The head block is provided with a tubular extension 29, preferably integral therewith and comprising the inner vsection of the inner cylinder or what will be hereinafter referred to as the piston yof the feed device. To this inner section is secured 4in suitable manner a second tubular section 30 closed at its outer end by a cap or thimble 31 secured to the section 30. The

section 30` is provided with one or more.l

orts 30m for the passage of the lmotive fluid into the interior of the piston.` By preference I provide this hollow piston with means for vlubricating the motive fluid as itl passes y therethrough on its way to the engine. To

and extending aXia y of the piston. This sleeve has a iange 32* at its outer end adapted to seat against the outer beveled edge of the inner section 29 of the piston. In this manner thereis formed an annular chamber 33 for the rece tion of a supply of lubricant which is fed th in the sleeve to the interior thereof, that is in the lpath of the motive fluid as it passes throng employ in this lubricant or oil chamber a wick such as a lamp wick 35 so that with a minimum uantity of lubricant the proper supply of t e lubricant through the holes 34 is possible. The lubricant chamber has a filling opening which is closed by' the screw plug 36. i

The outer cylinder or stationary part of the feed device is also preferably made of several sections. The outer end section 37 is tubular and closed by an end piece 38 carrying a suitable point 39. The inner end of t e section 37 is secured to a section 40 having an internal circular flange 40 between which and an inner section 4l is clamped` suitable ,packing 42 bearing against the sides of the piston of the feed device. This inner section 41 is held in place by means of the couplin ring 43 screwing upon the section 40 and having a' shoulder bearing against a corres ending shoulder on the section 41. In or er to hold the feed device in its closed or innermost position I prefer to provide telescopic cylinders,

. to the engine.

vunderstood that the motive iuid after passrough one or more holes 34' the feed device. Itis preferred to clamping bolts 511.

.the dog 44 which engages the coupling ring 43 as seen in Fig. '1.

The outer cylinder or cylinder proper is provided with an inlet 45' with which the air ose having a suitable, throttle (both vnot shown) are arranged to communicate. The motive fluid passes from the inlet 45 tothe space between the cylinder and its piston, passes through the ports 3()a into the piston itself, through the longitudinal bore of the sleeve 32 and into the chamber 22. .The first eiiect of the motive fluid is to extend the feed device and -thereby position the machine before the drilling-operationv can pro.-v ceed for, as will be understood from the preceding description, the port 23 is now closed by the valve 27 and no motive fluid can pass After the machine is thus positioned and when the motive fluid is of such pressure as to overcome the load of the spring 25 the motive Huid will move the piston 24 and the valve 27 downwardly fthereby opening the vort 23 and admitting It will be the motive fluid to t e engine.

ing through the feed device as explained passes through the port 28 and' enters the piston chamber 22. The iiu'id passes upwardly through theports and passages 27a in the head27 to the space-thereabove and simultaneously the fluid presses downwardly upon the upper face of the piston head 24, with the result that such head together with the head 27 is moved downwardly (speaking in reference to Fig. l) against the tension of the spring 25. Normally, as seen in Fig.

1, the piston head 27 closes the port 23 but when thus moved downwardly it will clear such port and thereby admit the motive iiuid to the ports' 23 and 25^and thence to the en- 10:5 gine.Y When the supply of motive fluid is shut ofrl the spring w1ll force the piston heads upwardly and close the port 23. The spring is adjusted to such a tension which is regulated by the adjusting plug 26 as neces- 11o sitates the accummulation of a predetermined amount of .pressure in the feed device,

say a ypressure v'of' twenty to twenty-five pounds, before it will be suiciently comypressed to allow of suiiicient movement of the valve to uncover the port 23 leading to the valve chamber of the drilling engine as above explained. The chamber 22 is closed at its upper end by means of the rotating handle 46 whose inner end screws into the 120 block 20 and serves as a screw plug. By means of this handle the drill may be supported and uided by hand.

The head lock and the cylinder are con- Inected or clamped together in any `suitable manner. In the present instance, the cylinder is provided with pairs of ears 49 l andthe head block with corresponding pairs ofA ears 50, through which ears pass the Il (l incasso l claim:

l. ln a tool of the class described, the combination of a drilling engine, a feed device connected therewith, means for feeding the motive fluid direct to said device, means of communication between the engine and air feed device, and a loaded valve inter posed in said communication;

2. ln a tool of the class described, the combination of a drilling engine, a feed de vice, a connecting member loeated betweenthe engine and device andhaving passage for the motive fluid from said device to the engine, means for feeding the motive iuid direct to said device, and a loaded valve interposed in said passage. i

3. lln a tool of the class described, the combination of a drilling engine, a feed device therefor comprising telescoping cylin ders, a connecting member connected on one side with the engine and on the other side with one of the telescoping cylinders, means for feeding the motive duid direct to said device, said connecting member having a motive fluid passage, and a loaded valve in terposed in said passage.

e. ln a tool of the class described, the combination of a drilling engine, a feed device therefor, a head block connected on one side with the engine and on the other side With the feed device, means for feeding the 'motive fluid direct to said device, said block havin a motive duid supply passage, and a loade valve in said passage comprising a spring pressed piston exposed on one side to the motive Huid, and a piston head connected `with the piston and governing said passage to the engine.

5. ln a tool of the class described, the combination of a drilling engine, a feed device therefor, a head block connected on one side with the engine and on the other side with the feed'device, means for feeding the motive fluid direct to said device, said block having a motive fluid supply passage, and a loaded valve in said passage comprising a spring pressed piston exposed on one side to the motive fluid, said passage terminating in a port communicating with the engine, and a piston head connected with the piston -With the feed device, means for feedin head governing said port.

6. In a tool of the class described, the combination of a drilling engine, a feed device therefor, a head block connected on one side with the engine and on the other eige t e motive fluid direct to said device, said lock having a motive fluid supply passage, and a loaded valve in said passage comprising a `spring pressed piston exposed on one .side

to the motive fluid, said passage terminating in a port `communicating with the valve chamber of the engine, and said engine including a plug closing one end of the valve chamber and having a portion interlocked With said port.

7. ln a tool of the class described, the combination of a drilling engine, a feed device therefor comprising telescopin cylinders, and means for feeding the motlve fluid direct to-the cylinders and thence to the engine, the inner cylinder having a head portion provided with an internal sleeve connected therewith at one end and seating thereon at its other end, said sleeve forming with said inner cylinder an annular oil chamber and having an outlet to the inte rior of the inner cylinder and in the path ofthe motive fluid.

8. ln a tool `of the class described, the combination of a drilling engine, a feed device, a connecting member located between the engine and said device and having a passage from said device to the engine, the air feed device comprising telescoping cylinders theinner one of, which is connected to said member and vprovided with an internal conical seat, a sleeve located within the inner cylinder and secured to said member and seating on said seat, the sleeve forming with the inner cylinder an annular oil chamber and having an oil port to the interior of the sleeve which communicates vvith said passage, and means forv su plying the motive fluid direct to the air eed device.

MATHER W. SHERWOOD.

Witnesses:

' JANos R. CocHnAND, MARY B. Eexnn'r. 

